Behavioral Health Belongs in the Food-System Protocol

A lunar food-system demonstration tests equipment, and it enters the crew’s working day. NASA can measure cultivation tasks, fresh-food interaction, sensory experience, workload, sleep, mood, and cognition during the same bounded mission. Placing those outcomes in the protocol before operations begin gives them standing beside mass, power, water, and crop yield.

Restraint gives the protocol its value. It would not presume a behavioral-health benefit from plants or fresh food. It would determine whether a food-production service changes crew experience, what burden accompanies it, and whether an observed effect remains after accounting for sleep, workload, practice, and mission phase. That answer can shape system design and the decision to advance.

What the record can support

Gastronaut’s neurocognitive and behavioral-health synthesis includes 553 analysable studies from 965 assessed records and 5,382 unique records. It contains 95 human-spaceflight studies and 298 human ground-analog studies. No full texts were retrieved for this review, so quantitative observations describe the indexed abstracts and do not establish what the full literature omits.

The pattern provides a signal, not a prevalence estimate. Among 149 human-tier observational records, 27 stated a positive or negative direction, and twenty-three of those 27 reported harm or decrement. Another 112 of the 149 used nondirectional categories such as “altered,” “mixed,” “measured,” or “not stated.” The directional group identifies a risk worth measuring. The nondirectional group limits any estimate of how often performance improves, worsens, or remains stable.

The group average is not the whole story. Dev and colleagues followed 25 astronauts across six-month ISS missions with NASA’s Cognition Battery. Performance remained stable across much of the mission at group level, while selected tests showed early-flight slowing in processing speed, visual working memory, and sustained attention. Across flight and postflight observations, 11.8 percent of scores fell at least 1.5 standard deviations below the sample’s baseline mean. An exploratory analysis found no clear pattern linking cognition with sleep or alertness ratings (Dev et al. 2024).

Ground-analog evidence shows why the protocol matters. Douglas and colleagues compared an enhanced diet with a standard spaceflight diet in 16 participants across four 45-day Human Exploration Research Analog missions. The enhanced-diet group had lower cortisol, better cognitive speed, accuracy, and attention, and a more stable microbiome and metatranscriptome (Douglas et al. 2022). This was a controlled analog result. It does not establish the effect of a particular crop, a lunar cultivation system, or a flight diet.

The horticultural record is smaller. That constraint makes direct measurement more useful. The synthesis classified six records under the horticultural or nature-exposure outcome family and 14 records as horticultural or nature-exposure interventions. Li and colleagues reported reduced heart rate, salivary cortisol, negative mood scores, anxiety, and reaction time after 15 minutes of viewing strawberry plants in a laboratory experiment. A long-duration isolated-environment component showed a similar mood trend without statistical significance (Li et al. 2020). The result supports measurement, not a general therapeutic claim.

Confidence is high that behavioral outcomes can be measured during human spaceflight and analog missions. Confidence is moderate that diet and plant interaction can affect selected outcomes under ground-study conditions. Confidence is low that the current evidence predicts the behavioral effect of an ORCA-supported lunar demonstration.

A protocol for a bounded mission

NASA can treat the food system as an operational exposure. The record should show what the crew did, when they did it, what they ate, and what else was happening. Keeping those conditions together protects a change in mood or cognition from being detached from workload, sleep, food use, or environment. A compact measurement package can include:

• task duration, interruptions, automation state, faults, and recovery;
• NASA Task Load Index or another prespecified workload measure;
• fresh-food offer, consumption, waste, and acceptability;
• brief repeated measures of mood, fatigue, sleep, and perceived restoration;
• a cognitive battery with parallel forms and practice-effect correction;
• mission phase, work schedule, carbon dioxide, light, noise, and other environmental conditions;
• medication, caffeine, and countermeasure use;
• privacy rules that separate research data from personnel evaluation.

Practice effects need an explicit rule. Among 104 human-tier records with a cognitive outcome, 12 abstracts named practice effects, parallel forms, or a separately learned baseline. Full texts may describe controls that the abstracts omit, but this synthesis did not retrieve them. A new protocol can resolve that ambiguity by declaring the correction method in advance.

Timepoint carries equal weight. A preflight baseline, an early-mission response, a later-mission state, and a recovery observation answer different questions. The synthesis found that cognition can be measured during exposure: 35 of 95 human-flight studies and 146 of 298 human-analog studies used inflight or during-campaign sampling. A lunar demonstration can use that advantage to preserve the mission phase in every finding.

The decision NASA can make

NASA faces a bounded decision, not a general question about gardening. It can ask whether a defined cultivation and fresh-food service changes workload, sleep, mood, cognition, or food use relative to a comparator period or crew, and whether the observed change should influence mission design.

Gastronaut proposes a joint protocol-design effort for one ground analog followed by a flight-readiness decision. ORCA is a ground-stage system at approximately TRL 3 to 4, with no flight or lunar operating history. Its role would be to provide a controlled operating exposure and traceable food record. NASA and research partners would retain responsibility for human-subject protections, behavioral endpoints, data governance, and inference.

The crew will live with the food system after the manifest is approved. A record of that encounter can carry their work, nourishment, and experience into the next mission decision.

References

Dev, Sheena I., et al. “Cognitive Performance in ISS Astronauts on 6-Month Low Earth Orbit Missions.” Frontiers in Physiology, 2024. https://doi.org/10.3389/fphys.2024.1451269.

Douglas, Grace L., et al. “Impact of Diet on Human Nutrition, Immune Response, Gut Microbiome, and Cognition in an Isolated and Confined Mission Environment.” Scientific Reports, 2022. https://doi.org/10.1038/s41598-022-21927-5.

Gastronaut. Neurocognitive and Behavioral Health: Evidence Synthesis. Report GAS-B4-NEU-20260822, evidence version 22 Aug. 2026. Research synthesis.

Li, Zhao-Ming, et al. “Psychophysiological and Cognitive Effects of Strawberry Plants on People in Isolated Environments.” Journal of Zhejiang University Science B, 2020. https://doi.org/10.1631/jzus.b1900331.

Gastronaut. ORCA Public-Safe System and Evidence Baseline. Evidence version 23 Aug. 2026. Company technical record.